Just install the Apk now you have achieve look and feel of s3 on galaxy y.

Download Galaxy SIII RINGTONES FROM THIS LINK it is a zip file containing six ring tone you will have to extract this file using file manager like Astro if using mobile or if on pc use winrar to extract it on sd card then play it in music player and set as ringtone

If u Not like the new icon look then follow these steps to back old icons.